linux-kernel - RE: [PATCH] zram: fix incorrectly stat with failed

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Message-id: <008f01cfb69a$60a5c850$21f158f0$@samsung.com>
Date:	Wed, 13 Aug 2014 09:59:17 +0800
From:	Chao Yu <chao2.yu@...sung.com>
To:	'Minchan Kim' <minchan@...nel.org>
Cc:	ngupta@...are.org, linux-kernel@...r.kernel.org,
	'Jerome Marchand' <jmarchan@...hat.com>,
	'Sergey Senozhatsky' <sergey.senozhatsky@...il.com>,
	'Andrew Morton' <akpm@...ux-foundation.org>
Subject: RE: [PATCH] zram: fix incorrectly stat with failed_reads

Hi Minchan,

> -----Original Message-----
> From: Minchan Kim [mailto:minchan@...nel.org]
> Sent: Tuesday, August 12, 2014 3:38 PM
> To: Chao Yu
> Cc: ngupta@...are.org; linux-kernel@...r.kernel.org; Jerome Marchand; Sergey Senozhatsky;
> Andrew Morton
> Subject: Re: [PATCH] zram: fix incorrectly stat with failed_reads
> 
> On Mon, Aug 11, 2014 at 04:39:17PM +0800, Chao Yu wrote:
> > Since we allocate a temporary buffer in zram_bvec_read to handle partial page
> > operations in this commit 924bd88d703e53d30f393fac6117f8f1bc79aab6 (Staging:
> > zram: allow partial page operations), our ->failed_reads value may be incorrect
> > as we do not increase its value when failed to allocate the temporary buffer.
> >
> > Let's fix this issue and correct the annotation of failed_reads.

[snip]

> How abouting moving failed_reads/writes in zram_bvec_rw?
> 
> int zram_bvec_rw(..)
> {
>         if (rw == READ) {
>                 atomic64_inc(num_reads);
>                 ret = zram_bvec_read(xxx);
>         } else {
>                 atomic64_inc(&num_writes);
>                 ret = zram_bvec_write(xxx);
>         }
> 
>         if (unlikely(ret)) {
>                 if (rw == READ)
>                         atomic64_inc(failed_reads);
>                 else
>                         atomic64_inc(failed_writes);
>         }
> }

I will send a v2 patch base on above codes of yours, please help to review the
following new patch.

> 
> >
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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> > Please read the FAQ at  http://www.tux.org/lkml/
> 
> --
> Kind regards,
> Minchan Kim

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